for further processing. Oxides produced by this method are mostly a mixture of ?-PbO and ?-PbO. The overall reaction, which is conducted at 450 °C is:
:Using a Ball mill, lead balls are oxidized in a cooled rotating drum. The oxidation is achieved by collisions of the balls. Just like in Barton pot method, the supply of air and separators may also be used.

Structure

As determined by X-ray crystallography, both polymorphs, tetragonal

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